RAID-10
offers
faster
data
reads
and
writes
than
RAID
5
because
it
does
not
need
to
manage
parity.
However,
with
half
of
the
DDMs
in
the
group
used
for
data
and
the
other
half
to
mirror
that
data,
RAID
10
disk
groups
have
less
capacity
than
RAID
5
disk
groups.
Overview
of
Copy
Services
Copy
Services
is
a
collection
of
functions
that
provide
disaster
recovery,
data
migration,
and
data
duplication
functions.
Copy
Services
runs
on
the
DS6000
series
and
supports
open
systems
and
zSeries
environments.
Many
design
characteristics
of
the
DS6000
series
and
data
copying
and
mirroring
capabilities
of
Copy
Services
features
contribute
to
the
protection
of
your
data,
24
hours
a
day
and
seven
days
a
week.
A
brief
description
of
each
of
these
licensed
features
is
provided
below.
You
can
manage
Copy
Services
functions
through
a
command-line
interface
called
IBM
TotalStorage
DS
CLI
and
a
Web-based
interface
called
IBM
TotalStorage
DS
Storage
Manager.
The
DS
Storage
Manager
allows
you
to
set
up
and
manage
the
following
types
of
data-copy
features
from
any
point
from
which
network
access
is
available:
Point-in-time
copy
The
point-in-time
copy
feature,
which
includes
FlashCopy,
enables
you
to
create
full
volume
copies
of
data
using
source
and
target
volumes
that
span
logical
subsystems
within
a
single
storage
unit.
After
the
FlashCopy
function
completes,
you
can
immediately
access
both
the
source
and
target
copies.
Remote
Mirror
and
Copy
The
remote
mirror
and
copy
feature
copies
data
between
volumes
on
two
or
more
storage
units.
When
your
host
system
performs
I/O
operations,
the
source
volume
is
copied
or
mirrored
to
the
target
volume
automatically.
After
you
create
a
remote
mirror
and
copy
relationship
between
a
source
volume
and
a
target
volume,
the
target
volume
continues
to
be
updated
with
changes
from
the
source
volume
until
you
remove
the
relationship
between
the
volumes.
The
following
functions
of
remote
mirror
and
copy
are
available:
v
Metro
Mirror
v
Global
Copy
v
Global
Mirror
Consider
the
following
Copy
Services
information:
v
The
feature
activation
codes
for
Copy
Services
features
(remote
mirror
and
copy
and
point-in-time
copy)
must
be
obtained
and
enabled
on
the
DS
Storage
Manager
before
you
can
begin
using
the
features.
FlashCopy
The
IBM
TotalStorage
FlashCopy
feature
provides
a
point-in-time
copy
capability
for
logical
volumes.
FlashCopy
creates
a
physical
point-in-time
copy
of
the
data,
with
minimal
interruption
to
applications,
and
makes
it
possible
to
access
immediately
both
the
source
and
target
copies.
The
primary
objective
of
FlashCopy
is
to
create
a
copy
of
a
source
volume
on
the
target
volume.
This
copy
is
called
a
point-in-time
copy.
When
you
initiate
a
FlashCopy
operation,
a
FlashCopy
relationship
is
created
between
the
source
6
DS6000
Host
Systems
Attachment
Guide
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